In the same episode, Davies pays homage to a beloved 1975 story for Tom Baker's Doctor, "Pyramids of Mars," by lifting a key scene and doing it better, with 21st century effects. It might look ...

Beneath a pyramid, the last of the Osirans — Sutekh the Destroyer — waits to be freed, to at long last bring his gift of death to all who live.

"The Devil's Chord" wasn't the first time the Doctor had shown a companion how a villain's actions in the past had the potential to change their present. 1975's "Pyramids of Mars" saw Tom Baker's ...